```
public abstract class ServantLocatorHelper
extends Object
```
When the POA has the NON_RETAIN policy it uses servant managers that are ServantLocators. Because the POA knows that the servant returned by this servant manager will be used only for a single request, it can supply extra information to the servant manager's operations and the servant manager's pair of operations may be able to cooperate to do something different than a ServantActivator. When the POA uses the ServantLocator interface, immediately after performing the operation invocation on the servant returned by preinvoke, the POA will invoke postinvoke on the servant manager, passing the ObjectId value and the Servant value as parameters (among others). This feature may be used to force every request for objects associated with a POA to be mediated by the servant manager.

构造方法
Constructor	描述
`ServantLocatorHelper()`

所有方法静态方法具体的方法
Modifier and Type	方法	描述
`static ServantLocator`	`extract(Any a)`
`static String`	`id()`
`static void`	`insert(Any a, ServantLocator that)`
`static ServantLocator`	`narrow(Object obj)`
`static ServantLocator`	`read(InputStream istream)`
`static TypeCode`	`type()`
`static ServantLocator`	`unchecked_narrow(Object obj)`
`static void`	`write(OutputStream ostream, ServantLocator value)`

public static void insert(Any a,
                          ServantLocator that)

public static ServantLocator extract(Any a)

public static ServantLocator read(InputStream istream)

public static void write(OutputStream ostream,
                         ServantLocator value)

public static ServantLocator narrow(Object obj)

public static ServantLocator unchecked_narrow(Object obj)

Class ServantLocatorHelper